# Can I annotate a PDF on my phone?

_Updated July 2026 · Arthize · https://arthize.com/answers/mobile-annotate-pdf_

Yes. Arthize runs in any modern mobile browser, so you can annotate a PDF from a phone or tablet with nothing to install. Annotating a PDF adds highlights, comments, shapes and notes on top of the page, so you can mark up a document without changing its text.

## Answer

Yes. Arthize runs in any modern mobile browser, so you can annotate a PDF from a phone or tablet with nothing to install. Annotating a PDF adds highlights, comments, shapes and notes on top of the page, so you can mark up a document without changing its text.

## More about annotate pdf

Annotations sit on top of the page and don't change the underlying text.

You can highlight, comment, draw and add notes.

Annotated files are ideal for review and feedback.

## How to annotate a PDF

1. **Open the editor** — Sign in and open the PDF editor.
2. **Add your PDF** — Upload the document to mark up.
3. **Add annotations** — Highlight text, add comments, draw shapes or leave notes.
4. **Download** — Save the annotated PDF.

## FAQ

### How do I annotate a PDF?

Annotating a PDF adds highlights, comments, shapes and notes on top of the page, so you can mark up a document without changing its text. On Arthize it's free with no watermark and processed privately.

### Can I highlight and comment on a PDF?

Annotating a PDF adds highlights, comments, shapes and notes on top of the page, so you can mark up a document without changing its text. On Arthize it's free with no watermark and processed privately.

### Is annotating a PDF free?

Annotating a PDF adds highlights, comments, shapes and notes on top of the page, so you can mark up a document without changing its text. On Arthize it's free with no watermark and processed privately.